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Question
Given image is a highly simplified representation of the human sex chromosomes from a karyotype.
The genes a and b could be of
Given image is a highly simplified representation of the human sex chromosomes from a karyotype.
The genes a and b could be of
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Solution
The correct option is C Haemophilia and red-green colour blindness
X-linked inheritance is the gene causing the trait or the disorder is located on the X chromosome. Females have two X chromosomes; males have one X and one Y. Genes on the X chromosome can be recessive or dominant. X-linked recessive genes are expressed in females only if there are two copies of the gene (one on each X chromosome). However, for males, there needs to be only one copy of an X-linked recessive gene for the trait or disorder to be expressed. For example, a woman can carry a recessive gene on one of the X chromosomes unknowingly, and pass it on to a son, who will express the trait. Examples of X-linked recessive conditions include red-green color blindness and hemophilia A.
X-linked inheritance is the gene causing the trait or the disorder is located on the X chromosome. Females have two X chromosomes; males have one X and one Y. Genes on the X chromosome can be recessive or dominant. X-linked recessive genes are expressed in females only if there are two copies of the gene (one on each X chromosome). However, for males, there needs to be only one copy of an X-linked recessive gene for the trait or disorder to be expressed. For example, a woman can carry a recessive gene on one of the X chromosomes unknowingly, and pass it on to a son, who will express the trait. Examples of X-linked recessive conditions include red-green color blindness and hemophilia A.
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